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Morphological and crystallographic anisotropy of severely deformed commercially pure aluminium by three-dimensional electron backscatter diffraction

Soroosh Naghdy (UGent) , Hadi Pirgazi (UGent) , Patricia Verleysen (UGent) , Roumen Petrov (UGent) and Leo Kestens (UGent)
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Abstract
The aim of this paper was to examine the morphological and crystallographic anisotropy that develops during high pressure torsion (HPT) processing. Commercially pure aluminum was subjected to monotonic HPT deformation at room temperature. Microstructure and texture were studied by large area EBSD scans. 3D-EBSD scans served to scrutinize the morphological anisotropy and local texture. It was observed that two distinct stages of grain fragmentation and saturation occur during processing. Grains exhibited an ellipsoidal shape rather than an equi-axed one. The major axes of ellipsoids showed a favorable orientation at steady-state stage: an almost 20˚ inclination towards the shear direction. The global texture was characterized by typical shear components of face-centered cubic metals at both stages. However, the local texture revealed a preferential fragmentation pattern in the first stage: orientations in the vicinity of ideal fibers became less heavily fragmented while non-ideal orientations broke up more severely. This phenomenon was linked with the lattice rotation required to bring an initial orientation close to a stable one. Although texture weakened considerably in the fragmentation stage, the texture index did not further decrease in the saturation stage. Saturation of texture, grain refinement and formation of microstructure are discussed in the light of different microstructural coarsening mechanisms.
Keywords
aluminum, high-Pressure torsion (HPT), three-dimensional electron backscatter diffraction (3D-EBSD), grain fragmentation, anistropy

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MLA
Naghdy, Soroosh, et al. “Morphological and Crystallographic Anisotropy of Severely Deformed Commercially Pure Aluminium by Three-Dimensional Electron Backscatter Diffraction.” JOURNAL OF APPLIED CRYSTALLOGRAPHY, vol. 50, no. 5, International Union of Crystallography (IUCr), 2017, pp. 1512–23.
APA
Naghdy, S., Pirgazi, H., Verleysen, P., Petrov, R., & Kestens, L. (2017). Morphological and crystallographic anisotropy of severely deformed commercially pure aluminium by three-dimensional electron backscatter diffraction. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 50(5), 1512–1523.
Chicago author-date
Naghdy, Soroosh, Hadi Pirgazi, Patricia Verleysen, Roumen Petrov, and Leo Kestens. 2017. “Morphological and Crystallographic Anisotropy of Severely Deformed Commercially Pure Aluminium by Three-Dimensional Electron Backscatter Diffraction.” JOURNAL OF APPLIED CRYSTALLOGRAPHY 50 (5): 1512–23.
Chicago author-date (all authors)
Naghdy, Soroosh, Hadi Pirgazi, Patricia Verleysen, Roumen Petrov, and Leo Kestens. 2017. “Morphological and Crystallographic Anisotropy of Severely Deformed Commercially Pure Aluminium by Three-Dimensional Electron Backscatter Diffraction.” JOURNAL OF APPLIED CRYSTALLOGRAPHY 50 (5): 1512–1523.
Vancouver
1.
Naghdy S, Pirgazi H, Verleysen P, Petrov R, Kestens L. Morphological and crystallographic anisotropy of severely deformed commercially pure aluminium by three-dimensional electron backscatter diffraction. JOURNAL OF APPLIED CRYSTALLOGRAPHY. 2017;50(5):1512–23.
IEEE
[1]
S. Naghdy, H. Pirgazi, P. Verleysen, R. Petrov, and L. Kestens, “Morphological and crystallographic anisotropy of severely deformed commercially pure aluminium by three-dimensional electron backscatter diffraction,” JOURNAL OF APPLIED CRYSTALLOGRAPHY, vol. 50, no. 5, pp. 1512–1523, 2017.
@article{8539569,
  abstract     = {The aim of this paper was to examine the morphological and crystallographic anisotropy that develops during high pressure torsion (HPT) processing. Commercially pure aluminum was subjected to monotonic HPT deformation at room temperature. Microstructure and texture were studied by large area EBSD scans. 3D-EBSD scans served to scrutinize the morphological anisotropy and local texture. It was observed that two distinct stages of grain fragmentation and saturation occur during processing. Grains exhibited an ellipsoidal shape rather than an equi-axed one. The major axes of ellipsoids showed a favorable orientation at steady-state stage: an almost 20˚ inclination towards the shear direction. The global texture was characterized by typical shear components of face-centered cubic metals at both stages. However, the local texture revealed a preferential fragmentation pattern in the first stage: orientations in the vicinity of ideal fibers became less heavily fragmented while non-ideal orientations broke up more severely. This phenomenon was linked with the lattice rotation required to bring an initial orientation close to a stable one. Although texture weakened considerably in the fragmentation stage, the texture index did not further decrease in the saturation stage. Saturation of texture, grain refinement and formation of microstructure are discussed in the light of different microstructural coarsening mechanisms.},
  author       = {Naghdy, Soroosh and Pirgazi, Hadi and Verleysen, Patricia and Petrov, Roumen and Kestens, Leo},
  issn         = {1600-5767},
  journal      = {JOURNAL OF APPLIED CRYSTALLOGRAPHY},
  keywords     = {aluminum,high-Pressure torsion (HPT),three-dimensional electron backscatter diffraction (3D-EBSD),grain fragmentation,anistropy},
  language     = {eng},
  number       = {5},
  pages        = {1512--1523},
  publisher    = {International Union of Crystallography (IUCr)},
  title        = {Morphological and crystallographic anisotropy of severely deformed commercially pure aluminium by three-dimensional electron backscatter diffraction},
  url          = {http://dx.doi.org/10.1107/s1600576717012754},
  volume       = {50},
  year         = {2017},
}

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